Editors: can work all posts ,categories and tags.. Media, Pages, Contact form,
Contributors : Only add new Posts, Comments, Contact, Profile
Authors: Can view all posts, and manage their own posts.
Subscriber: Can only view site, wp dashboard and their own profile
View other stuff is allowed on most roles.
None of the Roles above can view or work with Themes, Plugins, Users, Tools or Settings or any of the Plugin’s menus. like WP Mail, All in One WP, Sucuri, Updraft or Performance. Upto Authors can work the Contact form.
Todo build a table of capabilities..